Its county seat is San Antonio, the second-most populous city in Texas and the seventh-largest city in the United States. Bexar County is included in the San Antonio-New Braunfels, TX metropolitan statistical area. Bexar county includes Government Canyon state natural area in northwestern part of the county.
If the screen width is 7 feet and the projector's throw ratio is 2.0 - 2.4:1 (because projectors have zoom lenses, they also have a range of throw ratios) then you can place your projector anywhere from 14 to 16.8 feet away from the screen.
This is all calculated by the width of the screen and the projection distance. If the projector is 3m away, and your screen is 3m wide, the lens ratio required is 1:1. As you increase the distance to 6m away, on a 3m screen, you need a 2:1 lens. 12m away = 4:1 lens 18m away = 6:1 lens And so on... Hi Jonah, cinema's tend to use a 1:2 rule, whereas Kenny is suggesting a 1:8 rule for the church.